showed a trendP = 0.003
Regarding therapy modalities, PPV led to significantly improved visual outcomes (χ 2 = 87.15, P < 0.0001), and the pre-therapy VA displayed an important role in improving vision, especially the patient’s VA ≦logMAR 2.3 showed a trend of statistically significant improvement (χ 2 = 9.00, P = 0.003).